Crazy Cat

I agree with the other responses.  Since you haven’t filed anything yet, and it appears there is a desire to have a traditional wedding, you might be better off with a spousal visa.  Overall, a spousal visa is quite a bit cheaper, and much superior over the K1.
 
Good Luck!

Not allowed.  A K-1 must marry inside the US first.  Anything appearing to be a marriage before the visa holder enters the US could void the visa.  A better plan is to marry outside the US, then start the spousal visa (CR-1) process.

I dont think you will find it. Embassys march to the beat of their own drum and will blame each other if you go looking for answers. Patience is the key.

Follow the instructions she was given.  If the consulate fails to contact her in 4 weeks, email them.  Again, this comes directly from the page I linked above:
 
" If you do not receive the instructions from the U.S Embassy within four weeks of the NVC notification about the transfer of your case to the embassy, you may email the consular section directly at conslao@state.gov."

Not in Laos.
 
Apply for a U.S. Visa | Immigrant Visa Information - Laos (English) (ustraveldocs.com)
 
 
"Scheduling an appointment online
Please do NOT schedule your interview date until you have received an instruction letter from the U.S. Embassy. Below is the procedure to begin the process of scheduling an appointment online:"

Those same things could cause a K-1 to be denied.  It appears this is a straight forward adjustment of status case.   We can only advise based on what any OP tells us.  With what we know, I see no issues,

If the OP returns to home country before marriage, he/she still has to adjust status upon returning as a K-1 visa holder.  Then, the OP must wait for a Green Card (6 months to a year after entry).
If the OP marries, then returns home, the couple must start the spousal visa process.  That can take 18 months to 2 years or so.
If OP marries, then immediately applies for Adjustment of Status, then he/she will obtain a Green Card in 6-12 months (likely).  This is the fastest route to a Green Card under the current circumstances.  I see no reason to think the adjustment of status will be denied.
 
Personally, I think adjusting status is a good, viable route since OP is already inside the US.

I would NOT wait until September.  I would marry now, and submit the Adjustment of Status package BEFORE the expiration of your current stay.,,,,before the date in early June.  Once your current I-94 expires, you will be removable....until you file the I-485.  There are no benefits in waiting.  Here is the guide you need:
 
 

Interesting to see what the outcome would be. I'm pretty sure they won't have the oath until they're out of 90 day early window.

Consider yourself lucky. Due to the covid nonsense and the travel restrictions involved my fiancé (now wife) and I didn't see each other in person for 3 years. Problems are never as big as they seem, it will all work out in the end.

If the OP returns to home country before marriage, he/she still has to adjust status upon returning as a K-1 visa holder.  Then, the OP must wait for a Green Card (6 months to a year after entry).
If the OP marries, then returns home, the couple must start the spousal visa process.  That can take 18 months to 2 years or so.
If OP marries, then immediately applies for Adjustment of Status, then he/she will obtain a Green Card in 6-12 months (likely).  This is the fastest route to a Green Card under the current circumstances.  I see no reason to think the adjustment of status will be denied.
 
Personally, I think adjusting status is a good, viable route since OP is already inside the US.

Joint sponsor and household member are two separate "roles".  If your mother's income is sufficient to qualify on her own, it's best she be a joint sponsor.  Follow the I-864 instructions for joint sponsor.

***Thread is locked for review***

******You posted in violation of the Terms of Service*****.  
 
Attempt to bypass the Forums language filter through the use of alternative characters to spell profanities or through the posting of images containing profanity.
 
I suggest you read them.
TERMS OF SERVICE - VisaJourney

This only talks about eligibility for naturalization. My assumption is applicants are not scheduled for the interview before they're eligible (otherwise what's there to review) but I don't have it anywhere in writing.

D. 90-Day Early Filing Provision (INA 334)
An applicant filing under the general naturalization provision may file his or her application up to 90 days before he or she would first meet the required 5-year period of continuous residence as an LPR.[14] Although an applicant may file early according to the 90 day early filing provision, the applicant is not eligible for naturalization until he or she has reached the required five-year period of continuous residence as a lawful permanent resident (LPR).
 
https://www.uscis.gov/policy-manual/volume-12-part-d-chapter-6

Follow the instructions she was given.  If the consulate fails to contact her in 4 weeks, email them.  Again, this comes directly from the page I linked above:
 
" If you do not receive the instructions from the U.S Embassy within four weeks of the NVC notification about the transfer of your case to the embassy, you may email the consular section directly at conslao@state.gov."

It’s Laos the country, not Lagos in Nigeria.
 
*** Topic moved from Progress Reports to Process & Procedures ***

Not in Laos.
 
Apply for a U.S. Visa | Immigrant Visa Information - Laos (English) (ustraveldocs.com)
 
 
"Scheduling an appointment online
Please do NOT schedule your interview date until you have received an instruction letter from the U.S. Embassy. Below is the procedure to begin the process of scheduling an appointment online:"

If the OP returns to home country before marriage, he/she still has to adjust status upon returning as a K-1 visa holder.  Then, the OP must wait for a Green Card (6 months to a year after entry).
If the OP marries, then returns home, the couple must start the spousal visa process.  That can take 18 months to 2 years or so.
If OP marries, then immediately applies for Adjustment of Status, then he/she will obtain a Green Card in 6-12 months (likely).  This is the fastest route to a Green Card under the current circumstances.  I see no reason to think the adjustment of status will be denied.
 
Personally, I think adjusting status is a good, viable route since OP is already inside the US.

"
C. Visa Waiver Programs
A noncitizen admitted as a nonimmigrant without a visa under a Visa Waiver Program is barred from adjustment of status.[8] Similarly, a noncitizen admitted as a nonimmigrant without a visa to Guam or to the CNMI is barred from adjustment of status.[9] These bars do not apply, however, to those seeking to adjust status as an immediate relative of a U.S. citizen or VAWA-based applicants."

"
C. Visa Waiver Programs
A noncitizen admitted as a nonimmigrant without a visa under a Visa Waiver Program is barred from adjustment of status.[8] Similarly, a noncitizen admitted as a nonimmigrant without a visa to Guam or to the CNMI is barred from adjustment of status.[9] These bars do not apply, however, to those seeking to adjust status as an immediate relative of a U.S. citizen or VAWA-based applicants."

Is your fiance a US citizen?  Be aware that, once you submit a proper I-485, you will be granted authorized stay in the US until the I-485 is either approved or denied.

That is not accurate.  The average, as reported by other VJ members, is 440 days from filing to interview:
 

You can legally stay and adjust status after marriage.  However, be aware that you cannot leave the US or work for up to 6 months.  Good luck.

This certainly seems to outside the scope of a DIY case.  The possibility of 4 months in jail is significant, imho.